Azo dye.



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' OSCAR GT jNTHER, OF OPLADEN, NEAR COLOGNE, GERMANY, ASSIGNOR TO SYNTHETIC PATENTSCQ, INQ, OF NEW YORK, N. Y., A CORPORATION SF NEW YORK.

AZO DYE.

No Drawing.

To all whom it may concern Be it known that I, ()scnn Gtin'ruun, doctor of philosophy, chemist, citizen of the German Empire, residing at Upladen, near Cologne, Germany, have invented new and useful Improvements in Azo Dye, of which the following is a specification.

, I have found that new and valuable dyestuffs can be obtained by combining in an alkaline solution with diazotized orthoaminophenol compounds such monoazo dyes, as are obtained by combining a diazotized anth 'anilic acid compound with a 2-amino- 5-naphthol-7-sultonic acid compound in such a manner that the diazo compound enters into the nucleus containing the amino group. The new dyestuffs are after being dried and pulverized dark powders yielding upon reduction with stannous chlorid and hydrochloric acid an ortho-aminophenol compound, an anthranilic acid compound and a diamino derivative of a- 2-amino-5- naphtl1ol-7-sulfonic acid compound. T hey dye wool in red to violet-black shades, whichv by an after treatment with chromium compounds are changed into from bluish-black to greenish-black shades very fast to light, alkalis, acids, milling and potting.

In order to illustrate the new process more fully the following example is given, the parts being by weight: 431 parts of the dyestutF obtained by coupling in acid solntion diazotized anthranilic acid and 2- amino-5napht11ol-7 -sult'onic acid, so that the 1120' group is in the nucleus containing the amino group, are combined at a temperature of about 5 C. and in the presence of an excess of soda with the diazo compound prepared from 154: parts of d-nitro-z-amind phenol; after the combination is complete, the mixture is heatcdto C. and the dyestufi is separated by salting out. The dye is collected on a filter and dried. It is a dark powder soluble in water with a red violet, in concentrated sulfuric acid with av blue-violet coloration; yielding upon reduc tion with stannous chlorid and hydrochloric Specification of Letters Patent.

Application filed October 6, 1914-.

Patent .c.

Serial No. 865,299.

acid anthranilic acid, Qxl-diamino-l-phenol and lBJS-triamino 5 naphthol i sulfonic acid. It has in a free state most probabl' the formula: 1

/\ N ,i l-i N m n and yields on wool in an acid bath 7- .leauxred shades which on being, chron;x I change into a grcenish-black, verv fast a; alkali, acids, light, milling and pottimg'.

Instead of anthranilic acid itself another anthranilic acid compound can be used, such as clrloroanthranilic acid, nitroauthranilic acid, etc.: instead. of the nitroaminophcnol mentioned in the example other ()iftllOUfiillO- phenol compounds, such as picramic acid, lchloro-Z-aminophenol, its sulfonic acids. such as 2-amino-iphenol-4-sulionic acid, i2.ES-annnonaphthol-ii-sulfonic acid, etc, and mstcad of the 2.5-aminonaphthol-Y-suitnic acid its alkyland arylderivatives, suc as pl1enyl2.:" aminonaphthol 7 sulfonic acid, may be used.

l. The new coloring matters being derived from a diazotized anthranilic acid corpound, a diazotized ortho-aminophenol compound and a. 2-amino-5-napl1thol-7sulfonic acid compound, which are after being dried and pulverized dark powders; yielding upon reduction with stannous chlorid and hydro chloric acid an ortho-aminophenol compound, an anthranilic acid compound and a diamino derivative of a 1-amino ii-naphthol- T-sult'onic acid compound; dyeing wool in red to violet-black shades which by an after treatment. with chromium compounds change into bluish-black to greenish-black shades fast to light, alkalis, acids, milling and potting, substantially as described.

2. The new coloring matters being derived from diazotized anthranilic acid, a diazotized ortho-aminophenol compound and a 2-an1ino-5-naphthol --7 sultonic acid compound, which are after beingfdried and pulverized dark powders; yieldingupon reduction with-stannous chlorid and hydrochloric acid an ortho-amino-phenol compound, anthranilic acid and a diamino derivative of a 2.-amino-5-naphthol -7 sulfonic acid compound; dyeing wool in red to violet-black shades which by an after treatment with chromium compounds change into bluishblack to greenisl1-black shades fast to light, alkal'is, acids, milling and potting, substantially as described.

3. The new coloring matters being derived from oliazotized anthranilic acid, a diazotized nitrc-ortho-aminophenol compound and a Q-amino-5-naphthol-7-sulfonic acid compound, which are after being dried and pulverized dark powders; yielding upon reduction with stannous chlorid and hydrochloric acid an amino ortho-ainino-plhenol compound, anthra-nilic acid and a diamino derivative of a 2-amino-5-naphthol-7-sulfonic acid compound; dyeing wool in red to violet-black shades which by an after treatment with chromium. compounds change into bluishblacl: to greenish-black shades fast to light, alkalis, acids, milling and potting, substantially as described.

4. The herein described new coloring matter having in a free state most probably the which is after being dried and pulverized a dark powder soluble in water with a red-' violet and in concentrated sulfuric acid with a blue-violet coloration; yielding upon reduction with stannous chlorid and hydrochloric acid anthranilic acid, QA-diamino-lphenol and 1.2.6-triamino-5-naphthol-7-sultonic acid; yielding on wool in acid baths Bordeaux-red shades, which on being chromed change into greenish-black very fast to alkali, acids, light, milling and potting, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses,

OSCAR GUNTHER.

WVitnesses J. D. ZIESEGKE, LEE SOHVENTHAL. 

